Mechanism for operating pumps



JAS. ALDRICH IVHIPPLE, OF BOSTON, MASSACHUSETTS.

MECHANISM FOR OPERATING PUMPS.

Specification of Letters Patent No. 11,020, dated June 6, 1854.

To all whom, t may concern Be it known that I, JAMES ALDRIGH VHIPPLE, of Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Single-Barrel Double-Piston Pumps, of which the following is a full, clear, and exact description, reference beinghad to the annexed drawing, making part of this specification.

My improvements" are particularly applicable to that class of pumps in which two pistons are madeto reciprocate in a single cylinder and are represented in the drawing as so applied. They may however with advantage be applied to any species of force `or other pump wherever it is desirable to move the piston more rapidly than can be done by the means ordinarily employed. This desideratum is most likely to exist in cities where there is a considerable head upon the water pipes.` In such cases where c fire engines or otherpumps are attached directly to the hydrant it is necessary that the pistons move with`a velocity considerably greaterthan that of the water otherwise the latter is not thrown with a force greater than is due to the pressure in the hydrant. Efforts have been made to obtain this accelerated motion of the pistons by the employment of a cog wheel upon the shaft to which the brakes were attached which engaged immediately with toot-hed arms attached. to the piston rods. This arrangement however was found to produce great friction between the boxes and the pump cylinder principally due to the direction in which the power is applied to the piston rod; to remedy which it is necessary that the draught be applied to the piston rods directly over the center of the piston;l

-` to accomplish this and at the same time to give the necessary velocity to the pistons is the object of my present invention.

To enable others skilled in the art lto make and use my invention I will proceed to describe the` manner in which I have carried it out, referring generally to the main features of the pump and describing more particularly the improvements I have added thereto.

g1, g2, g3, g4, are the water ways of the two pistons, tothe centers of which are attached the piston rods A1 A2, the piston rod A1 of the lower piston passing through the center or very nearly so of the upper box. The upper extremities of these rods are furnished with teeth which will be hereafter referred to. The pump brakes H are attached to the central shaft F, to which is also securedthe cog wheel B; this wheel engages with` the cogged segments C, which are pivoted at the points z' within the air chamber of the pump; these segments are secured to the larger segments B, which engage with the rack teeth upon the top of the piston rods, the latter being guided by flanges upon the friction rollers E, which run in side straps 7c.

What I claim as my invention and desire to secure by Letters Patent :is-

The combination of the wheel B, the cogged segments C and D, and the racks upon the end of the pistons, by which I attain an accelerated motion of the pistons at the same time that the power which actuates them is applied in a vertical line, passing through their center great friction and wear of the pistons and pump barrel being c thereby avoided. 

